Examlex
From 1990 to 2013, mortality under age 5 has ________ and the literacy rate has ________ in China.
Optimal Quantity
The amount of a good or service that yields the highest net benefit to producers and consumers, considering costs and benefits.
Marginal Benefit
The surplus happiness or utility experienced from using an extra unit of any good or service.
Public Good
A public good is a good that is non-excludable and non-rivalrous, meaning it can be used by everyone freely without depleting its availability to others.
Nonrivalry
A characteristic of certain goods where the consumption by one individual does not reduce availability to others, often seen in digital or public goods.
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